--- /dev/null
+/*-------------------------------------------------------------------------
+ timeout.c - source file for running ucSim within the regression tests
+
+ Written By - Bernhard Held . bernhard@bernhardheld.de (2001)
+
+ This program is free software; you can redistribute it and/or modify it
+ under the terms of the GNU General Public License as published by the
+ Free Software Foundation; either version 2, or (at your option) any
+ later version.
+
+ This program is distributed in the hope that it will be useful,
+ but WITHOUT ANY WARRANTY; without even the implied warranty of
+ MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
+ GNU General Public License for more details.
+
+ You should have received a copy of the GNU General Public License
+ along with this program; if not, write to the Free Software
+ Foundation, 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA.
+
+ In other words, you are welcome to use, share and improve this program.
+ You are forbidden to forbid anyone else to use, share and improve
+ what you give them. Help stamp out software-hoarding!
+-------------------------------------------------------------------------*/
+
+#define PROGNAME "timeout"
+
+#define USAGE PROGNAME " : 1.00\n" \
+ "Usage : " PROGNAME " timeout_in_seconds filename [arguments]\n" \
+ " ´filename´ is executed, the arguments are passed to ´filename´.\n" \
+ " When ´filename´exits before the timeout expires, the\n" \
+ " exit-status of ´filename´ is returned.\n" \
+ " When the timeout expires before ´filename´ exits, ´filename´\n" \
+ " will be killed and an exit-status of 1 is returned.\n"
+
+/* First the program tries to limit the maximum CPU-time to the timeout-value.
+ Then the child is run with execvp().
+
+ It's not possible to limit the CPU-time under Cygwin (V1.3.3). If setrlimit (RLIMIT_CPU, rlp)
+ fails, the program will fork() and run the child with execvp(). The fork/exec pair is slow on
+ Cygwin, but what else can we do? The parent sleeps until:
+ - a signal shows the child´s exitus
+ The exit status of the child is returned.
+ - the timeout elapses
+ The child will be killed.
+*/
+
+#include <signal.h>
+#include <stdio.h>
+#include <sys/wait.h>
+#include <unistd.h>
+#include <sys/types.h>
+
+/* Get the status from all child processes that have terminated, without ever waiting.
+ This function is designed to be a handler for SIGCHLD, the signal that indicates
+ that at least one child process has terminated.
+ http://www.cs.utah.edu/dept/old/texinfo/glibc-manual-0.02/library_23.html#SEC401
+*/
+
+#ifndef WAIT_ANY
+ #define WAIT_ANY -1
+#endif
+
+void
+sigchld_handler (int signum)
+{
+ int pid;
+ int status;
+ int exit_status = 0;
+ struct rlimit rl;
+
+ /* remove limitation for CPU time */
+ if (getrlimit (RLIMIT_CPU, &rl) == 0)
+ {
+ rl.rlim_cur = rl.rlim_max;
+ setrlimit (RLIMIT_CPU, &rl);
+ }
+
+ while (1)
+ {
+ pid = waitpid (WAIT_ANY, &status, WNOHANG);
+ if (WEXITSTATUS (status))
+ exit_status = 1; // WEXITSTATUS(status);
+ /* pid == -1: no children */
+ /* pid == 0: no children to be noticed */
+ if (pid <= 0)
+ break;
+ }
+ exit (exit_status);
+}
+
+int
+main (int argc, char * const *argv)
+{
+ /* if getrlimit() / setrlimit() succeed, then no fork is neeeded */
+ int flagNoFork = 0;
+ long timeout;
+ pid_t pid_child;
+ struct rlimit rl;
+
+ if (argc < 3)
+ {
+ fprintf (stderr, USAGE);
+ return 1;
+ }
+ timeout = atol (argv[1]);
+ if (timeout == 0)
+ {
+ fprintf (stderr, "Error parameter " PROGNAME ": must be a non-zero dezimal value\n");
+ return 1;
+ }
+
+ /* try to use getrlimit() / setrlimit() for RLIMIT_CPU */
+ /* to limit the CPU-time */
+ if (getrlimit (RLIMIT_CPU, &rl) == 0)
+ {
+ rl.rlim_cur = timeout;
+ if (setrlimit (RLIMIT_CPU, &rl) == 0)
+ flagNoFork = 1;
+ }
+
+ if (flagNoFork)
+ /* the CPU-time is limited: simple execvp */
+ return execvp (argv[2], argv + 2);
+ else
+ {
+ /* do it the hard way: fork/exec */
+ signal (SIGCHLD, sigchld_handler);
+ pid_child = fork();
+ if (pid_child == 0)
+ return execvp (argv[2], argv + 2);
+ else
+ {
+ /* this timeout is hopefully aborted by a SIGCHLD */
+ sleep (timeout);
+ fprintf (stderr, PROGNAME ": timeout, killing child %s\n", argv[2]);
+ kill (pid_child, SIGTERM);
+ return 1; /* Error */
+ }
+ }
+}
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